The borrowing costs of the U.S. government have climbed to 5% for the first time since October 2023, as a sharp sell-off in global bond markets continues amid escalating oil prices and heightened inflation concerns. On Monday, the yield on the key 10-year U.S. Treasury bond hit this psychologically critical level, having previously dropped to around 4% earlier this year. This increase has been gradually occurring since the outbreak of the U.S.-Israeli war with Iran in late February.
This uptick in bond yields coincides with Brent crude oil, the international benchmark, rising above $108 per barrel. Oil prices have surged following attacks on Saudi Arabia’s energy infrastructure and growing Middle Eastern tensions. A series of drone attacks prompted Saudi Arabia to close a vital east-west crude pipeline, sparking fears about potential disruptions to global oil supplies. The situation is further complicated by assaults attributed to Iran-aligned Houthi forces and increasing tensions around the Bab al-Mandab Strait.
Concerns have intensified as Gulf states delayed talks with Tehran regarding a temporary shipping route through the Strait of Hormuz, a strategically crucial waterway that typically carries a large portion of the world’s oil and gas supplies. The combination of higher energy prices and inflationary pressures is creating uncertainty about future global interest rates. Investors are keeping a close watch on the U.S. Federal Reserve’s upcoming interest rate decision, with the Bank of England also set to announce its decision later this week.
The rise in U.S. Treasury yields is particularly significant for global financial markets because the 10-year Treasury serves as a benchmark for borrowing costs. As yields increase, financing costs for governments, businesses, and households worldwide could rise as well. In Europe, bond yields have also surged, with long-term UK government borrowing costs reaching their highest levels in decades. Rising energy prices and renewed geopolitical tensions have fueled concerns that central banks may need to maintain tighter monetary policies for a more extended period.
Throughout the year, oil prices have been highly volatile. Brent crude initially rose from approximately $72 a barrel before the conflict to a peak of around $126 in April, before easing during the summer amid hopes of a lasting ceasefire. However, prices have climbed once again as hostilities intensified and efforts to revive negotiations stalled. With oil prices now back above $100 a barrel, markets are facing renewed worries over inflation, interest rates, and the broader impact of prolonged disruptions to global energy and trade routes.